package itheima.service.impl;

import com.baomidou.mybatisplus.core.conditions.query.LambdaQueryWrapper;
import com.baomidou.mybatisplus.extension.service.impl.ServiceImpl;
import itheima.Mapper.SetmealMapper;
import itheima.common.CustomExcrption;
import itheima.dto.SetmealDto;
import itheima.entity.Setmeal;
import itheima.entity.SetmealDish;
import itheima.service.SetmealDishService;
import itheima.service.SetmealService;
import org.springframework.beans.BeanUtils;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Service;
import org.springframework.transaction.annotation.Transactional;

import java.util.List;
import java.util.stream.Collectors;

/**
 * @author shkstart
 * @create 2022-09-16-18:31
 */
@Service
public class SetmealServicelmpl extends ServiceImpl<SetmealMapper, Setmeal> implements SetmealService {

    @Autowired
    private SetmealDishService setmealDishService;
    /**
     * 新增套餐，同时需要保存套餐和菜品的关联关系
     * @param setmealDto
     */

    @Transactional
    public void saveWithDish(SetmealDto setmealDto) {
        //保存套餐的基本信息，操作setmeal,因为SetmealDto继承了SetmealDto
        this.save(setmealDto);

        //保存套餐和菜品的关联信息，操作setmeal_dish,执行insert操作
        List<SetmealDish> setmealDishes = setmealDto.getSetmealDishes();
        setmealDishes.stream().map((item)->{
            //设置套餐id
            item.setSetmealId(setmealDto.getId());
            return item;
        }).collect(Collectors.toList());

        //saveBatch:批量出入
        setmealDishService.saveBatch(setmealDishes);
    }

    /**
     * 删除套餐，同时需要删除套餐和菜品的关联数据
     * @param ids
     */
    @Transactional
    public void removeSetme(List<Long> ids) {

        //select count(*) from setmeal where id in (1,2,3) and status = 1
        //查询套餐状态，确定是否可用删除
        LambdaQueryWrapper<Setmeal> lambdaQueryWrapper = new LambdaQueryWrapper<>();
        lambdaQueryWrapper.in(ids != null,Setmeal::getId,ids);
        lambdaQueryWrapper.eq(Setmeal::getStatus,1);
        int count = this.count(lambdaQueryWrapper);
        if (count > 0){
            //如果不能删除，抛出一个业务异常
            throw new CustomExcrption("套餐正在售卖，不能删除");
        }
        //如果可以删除，先删除套餐表中的数据---setmeal
        this.removeByIds(ids);

        //delete from setmeal_dish where setmeal_id in (1,2,3)
        LambdaQueryWrapper<SetmealDish> lqw = new LambdaQueryWrapper<>();
        lqw.in(SetmealDish::getSetmealId,ids);
        //删除关系表中的数据----setmeal_dish
        setmealDishService.remove(lqw);
    }

    @Override
    public SetmealDto getWIthDish(Long id) {
        //查询套餐的基本信息，从Setmeal表中
        Setmeal byId = this.getById(id);

        //查询到的套餐信息拷贝给setmealDto
        SetmealDto setmealDto = new SetmealDto();
        BeanUtils.copyProperties(byId,setmealDto);

        LambdaQueryWrapper<SetmealDish> lambdaQueryWrapper = new LambdaQueryWrapper<>();
        lambdaQueryWrapper.eq(SetmealDish::getSetmealId,id);
        //因为一个套餐中有多个菜品，所以要用集合
        List<SetmealDish> list = setmealDishService.list(lambdaQueryWrapper);

        //设置菜品
        setmealDto.setSetmealDishes(list);
        return setmealDto;
    }

    @Override
    @Transactional
    public void updateWith(SetmealDto setmealDto) {
        //更新setmeal表中的基本数据
        this.updateById(setmealDto);

        // 先删除原来的套餐所对应的菜品数据。
        LambdaQueryWrapper<SetmealDish> lambdaQueryWrapper = new LambdaQueryWrapper<>();
        lambdaQueryWrapper.eq(SetmealDish::getSetmealId,setmealDto.getId());
        setmealDishService.remove(lambdaQueryWrapper);
        // 更新套餐关联菜品信息。setmeal_dish表。
        // Field 'setmeal_id' doesn't have a default value] with root cause
        // 所以需要处理setmeal_id字段。
        // 先获得套餐所对应的菜品集合。

        List<SetmealDish> setmealDishes = setmealDto.getSetmealDishes();
        //每一个item为SetmealDish对象

        setmealDishes = setmealDishes.stream().map((item)->{
        //设置setmeal_id字段。
            item.setSetmealId(setmealDto.getId());
            return item;
        }).collect(Collectors.toList());
            // 重新保存套餐对应菜品数据
        setmealDishService.saveBatch(setmealDishes);


    }
}
